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Technology Factsheet

MILWAUKEE Worm Drive Circular Saw

Category: Dismantlement > Mechanical Cutting Equipment > Circular Cutting Saw
Reference # : 6377 Model No :

The MILWAUKEE is a worm drive power tool for cutting wood and/or metal, having a thin steel disk with a toothed edge that rotates on a spindle. This saw features precision-machined worm gears and ball bearings and a lower guard that pre-opens for bevel cuts. Technical specs are 120-v; 15 A; 4,400 revolutions per minute (RPM); and some safety specs including a trigger switch, a spindle lock button, a lower guard lever, and a tightening bolt. The trigger switch regulates the speed of the tool. The further the trigger is depressed, the higher the speed of the saw. To turn the tool off, the user only needs to release the trigger and the saw automatically stops running after a few seconds. Although the MILWAUKEE worm drive saw is primarily designed and intended for cutting wood, it can be used for cutting metal, fiberglass, and masonry if saw blades are selected properly. This tools weighs approximately 15 lbs., and its dimensions are 1’ 7” L x 8” W x 10.5” H. Worn Drive Circular Saw Blade Description The following blades were used during the glovebox FRP crate size reduction: Black & Decker (Piranha 73-374)– This blade is a carbide- tipped saw blade for smooth wood cutting. This blade is 7 1/4” diameter with 40 teeth.

Benefits

(1) The MILWAUKEE circular saw was effective in completely size reducing one glovebox FRP crate. (2) Production rate and cutting rate are approximately 70% and 50% (respectively)higher than the DEWALT reciprocating saw. (3) LANL technicians found this saw heavy but relatively fast and easy to maneuver during cutting activities. The saw successfully cut the carbon steel pipe with no problems. The saw blade did need to be changed after metal was cut, however, because it became dull and a few teeth broke. A reciprocating saw was used to finish some small cuts in difficult areas on the crate where the MILWAUKEE could not reach. (4)The saw is mobile, easy to operate, and its setup and blade replacement are relatively simple. Technicians found this tool safe and got familiar with it quickly. In addition, it is easy to clean. (5) The MILWAUKEE circular saw is relatively inexpensive compared with the job that can be done. (6) Cutting activities can be conducted under safe conditions for operators, evaluators, and the environment. LANL did not experience the considerable heat transfer expected while cutting activities occurred.

Limitations

(1) The MILWAUKEE circular saw is relatively heavy (15 lbs.). This aspect can become an ergonomic hazard for workers . Operator fatigue was visually observed while cutting operations were ongoing. (2) The MILWAUKEE circular saw is considered a powerful tool for crate opening but needs a reciprocating saw as auxiliary tool to finish some difficult areas. (3) A drawn cutting line is needed to facilitate straight cuts. (4) The MILWAUKEE circular saw produced noise up to 105 decibels (dBA), which represents a potential noise hazard for operators. (5) Vibration levels for the MILWAUKEE worm drive circular saw were measured in terms of velocity at the front handle as >0.200 in/sec and at the rear handle as 0.169 in/sec. This level of vibration represents a Hand/Arm Vibration Syndrome (HAVS) hazard for workers who use this tool on a regular basis (8 hrs/day). (6) Cutting area was visibly dusty while cutting activities were ongoing. LANL technicians perceived a very strong odor while cutting volatilized fiberglass. (7) Significant amounts of secondary waste are generated, both sawdust and airborne particulate.

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